The Rams probably will not change offensive coordinators every year for the next five seasons, as the 49ers improbably did in Smith's first five, but they still need to be careful with rookie No. 1 overall choice Sam Bradford.

Early indications suggest the Rams would like to follow the plan Philadelphia took with Donovan McNabb back in 1999, when Rams offensive coordinator Pat Shurmur was coaching the Eagles' tight ends. Doug Pederson opened as the Eagles starter that season, allowing McNabb to ease into the starting role. McNabb got some reps off the bench before taking over as the starter in November.

In setting expectations for Bradford, I looked at production by rookie quarterbacks since 1970. The list featured several older players, some with experience in the CFL or USFL. I filtered out those players by focusing only on quarterbacks who were 25 or younger as NFL rookies. A quick look at them by games started:

16-game starters

There were only five, in part because the NFL season spanned only 14 games until 1978.

The ones who took the most sacks as rookies -- Carr (76) and Mirer (47) were the only ones to absorb more than 32 -- had the poorest careers. That might suggest the players had a hard time recovering from the beatings they took early in their careers. It also might reveal something about the quarterbacks' ability to process information quickly enough to get rid of the football before trouble arrives.

Offensive lines tend to take disproportionate blame for sacks, in my view. Quarterbacks are often responsible for them as well.

11- to 15-game starters

None in this group threw even 20 touchdown passes in a season (Manning and Dan Marino are the only rookie quarterbacks since 1970 to reach that barrier as rookies).

We should expect modest production from Bradford even if he starts most of the Rams' games.

Ben Roethlisberger was a rarity among this group by completing at least 60 percent of his passes, but rookie completion percentage wasn't a reliable indicator for career success overall.

Some quarterbacks ranking lower played when teams ran higher-risk offenses and rules made it tougher to complete passes.

6- to 10-game starters

Hall of Famers Marino, John Elway, Terry Bradshaw and Dan Fouts fell into this group.

There were a few disappointments -- Ryan Leaf, Cade McNown, Kyle Boller and the 49ers' Smith, who still has a shot at redemption -- but this seems like a reasonable number of starts for a quarterback drafted early.

Unlike Carson Palmer, who sat out his rookie season as a high choice in Cincinnati, Bradford is going to play as a rookie unless he gets hurt.

It's reasonable to expect Bradford to start at least half the games, putting up modest numbers. He'll probably struggle some, and that is OK, but it's a bad sign if the Alex Smith comparisons apply by season's end. Smith tossed one touchdown pass with 11 interceptions as a rookie. He wasn't ready and his supporting cast gave him little chance. That's a bad combination.